Since 2008-08-11: 450134 – Investigate possible performance improvement for autocomplete by using the directory search facilities

Since 2008-08-26: 452221 – When all mails has same subject(i.e. very long thread), time to take Shift+Delete of all mail seems to be O(num_of_mail**2), and “CPU 100% by the Shift+Delete” locks UI while delete operation